1. In a large pot, combine the first 9 ingredients. Bring to a simmer, cover tightly, and simmer until potatoes are three-quarters done, about 10 minutes.
2. Whisk cornstarch into soy sauce and stir into the stew. Add celery, carrots and bell pepper. Return to a simmer, cover and cook until vegetables are almost tender, 5-6 minutes, adding peas during the last 2 minutes.
3. Sprinkle with cilantro and green onions. Pass remaining garnishes